Machine tool feeding mechanism



W. G. HOELSCHER MACHINE TOOL FEEDING MECHANISM Filed Sept. 16, 1935 3 SheeS-Sheet l Wim )f1/wd WM ATTORNEYS March 23, 1937. w. G. HoELscHER MACHINE T ooL FEEDING MECHANISM Filed Sept.- 16, 1935 3 Sheets-Sheet 2V W. INVENTOR ATTO RN EY m Il Il I

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.MIIIIII-ummm March 23 i937- W. G. HOELSCHER MACHINE TOOL FEEDING MECHANISM Filed Sept. 16, 1935 5 Sheets-Sheet 3 NVENTOR.

A TTORNEYS Patented Mar. 23, 15,937

Aralar orFicE MACHINE TOOL FEEDING MECHANISM Appiication September 16, 1935, Serial No. 40,715

16 Claims.

This invention relates generally to machine tools and is particularly directed to improvements .in tool feeding mechanism and the control thereof. The improvements are preferably incorporated in a lathe for an accurately controlled tool carriage feed.

In producing accurate duplicate work such as counterturning, squaring up shoulders, grooving and necking for grinding, on quantities of parts,

lo it is necessary that the feed to the carriage be accurately disconnected at the same point or points on each successive piece of work. It is also necessary to high eiciency and greater production that this disconnection be entirely automatic, regardless of the number of shoulders to be turned, for example on a given shaft.

It is therefore an object of the present invention to provide an improved feed control mechanism for the carriage of a lathe by means of which the carriage can be automatically stopped at a plurality of points for performing definite counterturning or shoulder operations on work, and enabling duplication of the operation on successive parts with a high degree of accuracy.

25 In setting the control mechanism for accompiishing feed discontinuance at predetermined points, the following fact must be taken into consideration. A certain amount of shifting movement brought about by the carriage movement o itself is necessary to disconnection of the carriage feed control clutch. In order to locate the contacter throw out parts so that the power disconnection occurs at just the right instant it has been necessary to develop a novel arrange- 35 ment for placing the mechanism in a position for setting the throw-out parts with the clutch disengaged.

It is therefore a further object of the present invention to provide a mechanism associated o with the control elements, whereby the automatic stop unit may be placed against a positive stop where the clutch is disengaged and where the stop dogs can be suitably set against the carriage contact member with the carriage in the proper posi- 45 tion in each instance for the shoulder to be cut.

Therefore, when the control mechanism is returned to normal operating position the contact elements will be in position for engagement slightly ahead of actual power disconnection or 50 the exact amount necessary to clutch throw-out movement. In other words, it is unnecessary for the operator to try out each setting of each control element to determine when the actual power disconnection occurs. He can be assured in advance that the tool will be stopped in its longitudinal feed at the exact intended point on the work without the awkward and time-wasting tests heretofore required.

It has also been recognized that it frequently occurs in a given run of work that there are differences in the depths of the center holes in which the spindle of the tailstock engages, as well as differences in the length of the Work. Each variation would ordinarily require a resetting of all of the control mechanism for disconnecting the power when the particular shoulders are reached.

It is therefore a still further object of the present invention to provide a contact means associated with the carriage, adapted for engagement wth the stops of the control mechanism, which is adjustable to compensate for variations in the depths of center holes or the length of the work, whereby the operator can, by the simple operation of varying the position of the contact element longitudinally of the carriage, make it possible to proceed with each succeeding piece of work without altering the various positions of the stop or control mechanism in the least.

Other objects and certain advantages will be more fully apparent from a description of the accompanying drawings, in which:

Figure l is a perspective View of a lathe incorporating the present improvements, those parts which are concerned in the present invention such as the means for accurately and automatically tripping the longitudinal feed at predetermined points and the means for compensating for variation in the depths of center holes being shown in shaded lines.

Figure 2 is a fragmentary and partially sectional view looking at the front of the lathe, showing the details of the carriage feed and the carriage movement control mechanism.

Figure 3 is a sectional view taken on line 3 3, 40 Figure 1, showing in enlarged detail the contact lever which engages the feed stop dogs and trips out the power to the carriage.

Figure 4 is a fragmentary View looking at the f front of the carriage and illustrating the adjustable contact lever which is adapted for longitudinal resetting when there is variation in the depths of the center holes and the work being turned.

Figure 5 is a fragmentary sectional view taken on line 5 5, Figure 1, illustrating the connection between the rotatable section and translatable. section of the stop dog bar.

Figure 6 is a fragmentary View looking at the front of the stop dog bar and further detailing the connection mentioned in the description of Figure 5.

Figure 7 is a sectional View taken on line 1-1, Figure 2, illustrating the support bracket at the tailstock end of the lathe, which mounts the carriage lead screw, the feed rod, and the stop dog bar.

Figure 8 is a sectional view taken on line 8-8, Figure 3, illustrating the pivotal mounting for the stop dog contact lever of the carriage.

Figure 9 is a sectional view taken on line .fi-9- t Figure 3, illustrating the detent means for holding the stop dog Contact lever in set position.

Figure l0 is a sectional View taken on line I O-I, Figure 4, illustrating the details of the adjustable mounting for the stop Vdog contact lever.

Figure 11 is a sectional View taken on lineV II-I l, Figure 4, further detailing the adjustable in this application relate entirely to the operation Y ofthe carriage and control ofv the carriage feed movement. AnA automatic longitudinal stop mechanism for the carriage is provided which automatically tripsthe longitudinal feed at predetermined pointsby means of adjustable dogs spaced as desired along a stop bar. As the contactV meansof the .apron of the lathe 4contacts with each: of these dogs a clutch in the feeding mechanism is disengaged, stopping the tool carriage. When the contact means of the carriage is moved from contact with the particular stop: dog, the feed clutch automatically re-engages4 and the carriageis ready to move on to the next stop. The advantagefof this automatic stop mechanism foruduplicate work residesrparticularly in eliminationffjofY delays due to work measurement and thus'perm'its the lathe `to actually cut metal more minutes per hour which, of course, results in more finished pieces 'oflwork per day.

A novel arrangement has been `provided for con- Venientand accurate setting of the stop dogs along the, bar. By operating a bar control leverV at'h the; tailstock end Yof the bed, the stop bar is movedendwise against a positive stop and the feedl clutch isY automatically held in its disengagedposition whilerthe stop dogs are being located.A The bar control lever is thenreturned to its original operativeposition for allowing enf gagementbofthe clutch and the, automaticstop mechanisr'nis ready to function.

With this arrangement the stop dogs can be convenientlyset,bymeans of gauge or scale measurements with the absolute .assurance that the feed will triprautomatically at exactly the rightl point for every shoulder. This Adog setting arrangement eliminates guess work in locating the stop dogs and is sure to `bring ,about accurate results. It can bedepended uponto produce any quantity of duplicate work to verygelose limits of.V

accuracy and has the combined advantages of providing an automatic trip for the feed at predetermined points and of positively locating points for squaring up shoulders, grooving and necking for grinding.

The center hole compensator is provided for use under conditions where there are variations in the cut-off lengths of thework Vor in the depths of the center holesin the work ends, which variations Would cause extreme inaccuracy unless the stop dogs were reset. Generally speaking, therefore, the purpose of the device is to eliminate the need for resetting ofthe stop dogs or shifting of the tools to match theposition of the work on the lathe centers asthe ends of successive shafts are in different relations to the tailstock spindle. After the stop dogs have been definitely positioned onthe-stop bar, the variations in the work are compensated for by slightly altering the position of the contact lever of the carriage which actuatesthe feed stop dogs and trips out lthe power feeds.A "ThisOmpenSates for variations in the. w ork,` which may., beA observed between then firstl stop dog` and the. carriage trip or contact elementy when the cutting tool is touching the work end at the tailstock position, and does not change the relativepositions of thedogs with relation to each other or thetripoutclutch in the feed mechanism. Otherwise stated, the trip lever of the carriage is simply. moved Alongitudinally .the amount of the variation,'thatis toward or from the first stop dog, when theshafts .vary in longitudinal positions on thespindles..

The.. adjustable element is `mounted on the apronwhere it is` in a position convenient -to thev operator and .where he can see the tool position,

tion of theparts to a conventional lathe, the com..

plete lathe is shown'invroutline in Figure 1. n Many ofd the parts are unimportant to thepresent inventionand for this reason the reference thereto will be quitebrief.. The ,bedof the lathe is indicated at A20andis supportedon legs 2|,l 2l. The

conventional heads'tockiZZ -is provided at one end of the bed and the tailstock 23 at the other end;

The toolcarriage 24,is disposed intermediate of the stocks and is adapted for longitudinal slidingV movement on the ways .25 4of the bed. The imprcvements herein concerned are directly related toY the carriage, particularly to thev apron 26 thereof. Also, the feed box 2l is important insofar as itcontains the clutchand gearing for driving the. carriage feed rod 28 rand lead screw 29.

The lead screw and feed rod have adjacent ends j ournalled lin the feed box and a compound brack-V eted at Athe tavilstock.end Lofl the lathe respectively (see Figures ,1 and 2V). The lead screw and feed rod tr a verse the carriaga'being in driving connectioni .therewith in the Y conventional manner for A. moving the carriage longitudinally `along the wars or the. bed..

A shaftcouphnghsleevel is journalledin the end wallw32 ,of ,the feed box., A head 33 on the However, any

-pin 43.

inner end of this sleeve and nuts 34 on its screwthreaded outer end hold it in position in the wall against longitudinal movement. The adjacent end of the lead screw is counterturned and extends into the sleeve where it is rotatively xed by means of a pin 35.

A bearing sleeve 36 is loosely fitted in the inner end of the coupling sleeve. A transmission shaft 38 has its end supported in the bearing sleeve 36 and carries a driving sleeve 39 thereon. Shiftable gear 40 is in splined connection with the driving sleeve and includes clutch teeth 4I engageable with adjacent teeth 31 on the coupling sleeve 36.

'I'he feed rod 28, functioning additionally as the clutch shifting rod by virtue of longitudinal shifting movement, has its end supported in a clutch sleeve 42 pinned thereto by means of a The clutch sleeve in turn is slidably supported in a gear 44 constantly meshing with gear 40 and having clutch teeth 45 adjacent to or engaged with the teeth on the clutch element or sleeve 42 upon longitudinal movement of the feed rod. The gear 44 is rotatively and slidably journalled in a fixed bushing 46 in the feed box wall. The gears 40 and 44 are fixed together against relative longitudinal or axial movement. When the gear 40 is shifted into clutch engagement for lead screw operation, gear 44 is moved away from connection with the clutch element 42 so that feed rod operation cannot take place. The feed rod is normally held in longitudinal position with the feed rod clutch (sleeve 42 and gear 44) in engagement apart from use of the lead screw.

A thrust collar 41 is secured to the feed rod by means of a pin 48 in position against the outer end of the clutch element or sleeve 42. An end thrust roller bearing 49 is disposed on the end face of the collar and the arm 58 extended up from the stop dog bar 5| engages the protruding race of this bearing 49.

As shown in Figure 2, the teeth of the feed rod clutch are disengaged and the entire mechanism associated with the feed rod is shown in the corresponding position, that is, with the carriage abutting one of the stop dogs. The journal bracket 38 at the tailstock end of the lathe incorporates means for spring urged clutch engaging movement of the feed rod. The means for accomplishing this consists of the following parts.

A sleeve 52 is xed Within the bracket and rotatively and slidably journals a spring retaining sleeve 53 which is in spline connection with the shiftable feed rod. The spring retaining sleeve 53 is counterbored to provide a shoulder at its inner end and a coil spring 54 is mounted in the chamber provided by the relationship of this counterbore with the rod. This spring is held under compression between the shoulder and a collar 55 pinned to the outer end of the feed rod.

An end thrust bearing assembly is provided. This bearing provides two sets of ball bearings. An end race 56 thereof is engaged within the sleeve 52 and against the end of the spring retainer sleeve 53. 'I'he intermediate race 51 is of larger diameter and lies against the end of the first mentioned sleeve or bushing 52. A cap 58 contains the other end race 59, this cap including a boss portion engaging the central race 51 and clamping it in position. The cap is held in position by means of screws 68. A feed rod shift movement limiting collar 6| is pinned to the shaft for abutment with the closure cap. Accordingly, when the feed rod is moved toward the feed box for declutching, the spring 54 is further compressed and promptly, upon release of the shift rod, will act to return the shift rod to normal clutch engaged position with the collar 6I lying against the closure cap. The spring retainer element 53 and the outer races rotate with the shift rod.

Accordingly, it will be seen that the feed rod moves the carriage along the ways of the bed in turning operations on the work and the power connection thereto is disconnected through the feed rod by longitudinal translation or axial movement of the rod. This longitudinal or axial shifting movement in the declutching direction is accomplished by means of the rigid arm 58 which projects upwardly from the stop dog bar 5l and which is mounted in the side of the bed in parallelism With the lead screw and feed rod and below the same. This rigid arm includes a bore 63 in its upper end which is of larger diameter than the feed rod and is traversed thereby.

The bar includes a semi-dovetail portion 66 along its rear side, which is slidably mounted in corresponding slots 61 cut in the forward faces of supporting blocks 68 attached to the under side of the bed by means of screws 69. The rigid shift arm 50 includes a foot portion 10 which is attached to the top face of the bar by means of screws 1I. The outer face of the bar is provided with a longitudinally disposed dovetail portion upon which are adjustably mounted the stop dogs, these dogs including dovetail slots 12 corresponding to the aforesaid portion of the bar.

A suitable clamping bolt 13 is provided for each stopY dog of the same character as that shown for clamping the adjustable trip or contact means of the carriage in place as will be described hereinafter. Each of the stop dogs 64 includes a contact arm 14 extending parallel with the bar and toward the tailstock end of the lathe, whereby its outer end is disposed for en-r gagement or contact by the trip or contact lever 15 mounted on the carriage.

An end section of the shifting bar or actuator for the feed rod is in the form of a rod 16. This rod extends into and is mounted in the journal bracket 38 at the tailstock end of the lathe. An actuator screw 11 extends through a nut 11gu secured in a boss of the journal bracket 38 by means of set screws 18 and imparts longitudinal movement to the stop dog bar by means of end contact through appropriate throw-out means.

A handle 19 is secured to the outer end of the rod by means of a pin 85 and is in the form of a crank including a knob 8| on its angularly extended end. A plug 82 is screwed in the end of the bore opposite to the end containing the nut,

this plug supporting the rod 16. The end of the rod within the bore is counterturned. A collar 83 lies against the shoulder formed by the counterturn and fits snugly within the bore being pinned to the rod and forming the retainer or abutment for a coil spring 84 under compression about the rod between the plug 82 and the collar 83. An end thrust ball bearing 85 is disposed between the collar 63 and the screw 12. The inner end of the screw engages the end race of the end thrust bearing and includes a pilot extension 36 projecting into the bore of the bearing race.

The connection between the rod 16 and the bar sections consists of the following arrangement. (See Figures 5 and 6.) A block 81 is secured to the face of the bar at the extreme end thereof. The rod extends loosely into this Rotation ofthe crank-handle produces'longitudinal;v shiftingl of thelbar through the mediumr of the screw and nut suiicient for shifting the feed rod and declutching the power to the feed rod. The coil spring 84 under compression tends ,to maintain the screw andfshifting ,bar-against idle relative longitudinal movement, always tending to move the bar back toward normal `position with the clutch in engagement, or the position where the stop dogs will be in. position-.for declutching at the proper moment.

Theamount Whichthe stop bar. is movedis definitely limited by means. of anI adjustable stop screw associated with the bar andadaptedto contact the supporting block atithe headstock endA of the lathe. For this purpose a screw 9| having a large-headSJZy is engaged into the rear'v face of the stop dog bar. The head of this screw is provided witha lscrew-threaded bore'parallel with ther bar. The adjustable Contact screw-00 is engaged through this bore and includes a counterturned contact end 93 for abutment with the supporting block 68. A lock: nut 94 is rprovided for'securingthis contact screw 9| inv set position. When the operator moves the stop dog -bar by rotating the crank handle '9 the feed rody clutch is disengaged'and is automatically held in disengaged position against the block 68 while the operator sets Vthe stop-dogs. for the bar limits bar movement to aposition where the clutch teeth of the feed clutch. are clear a minimum-amountv for declutching. When the dogs are set the stop dogfbar is returned by reverse movement of the crank handle to normal position and the stop dogs are Athen in the` proper positions where they will be engaged and.: moved by thecarriage, declutching atl just the s.

right movement for accurate shoulder work.`

As stated heretofore, the contact means or the lever mounted on` the carriage for engagement with the stop, dogs is longitudinally adjustable for setting the same an amount corresponding to the difference in depthof the center. holes cri succeedingpieces of `work `or Vfor diierences in the length of the work. For this purpose the following arrangement is embodiedat the base of the apron.`

A supportingelement or plate 95 is secured to the under side of the apron by means of screws 98. (See Figure 10.) The under side ofthisplate i' includes a dovetail groove 91 extendedin parallel- AnN adjustable. pivot.:

element 98 for the contact lever is supported'in' ism with the stop dog bar.

this dovetail slot, having a dovetail portion 99 for this purpose.. journalled through the pivot element in parallelism with and within'the dovetail portion. vThis rod includes a screw-threaded end toward the tailstock end o1 the lathe, engaged in arixed nutA |01 secured, to the plate or support element 95.; Longitudinal displacement of the adjustable rod prevented by'm'eans of an integral collar por- Y tion |02l engaging the end of the pivot plate adjacent Athe screw-threaded portion (see Figure 2), and a washer |03 engaging the opposite end of the element held in position by means of the adjusting, nut |04- pinned to the rod.

As lshown in Figure 11, a clamping bolt |05 is extendedthrough the support element crosswise to the dovetail portion for xing the plate in vpositienih This bolt includes. a transverse slot-|06 The stopmeans A `rotatable adjustment rod |00 is.

adapted to be clampedrthereagainst by means of..

aznut |01 .on-:the exteriorly screw-threaded end of the bolt. The adjustment rod is counterturned as at |08fto clean thisbolt.

The pivotV plate includes a wide end ange |09. The contact lever `'I5 is pivotedon'the upper rear corner-'of this flange or plate-portion by means of a .pivot screwV |0. (See Figure 8.) The lever includes a `contact segment extended across the plate or. liange portionof the pivot element, which segment has a curved edge ||2, the margin of which is adapted to be swung into position where it is linefwith the stop dogs `for contact with thesame.`

A detent ||3 is provided inthe lever, including theusual plug ||4,fspringv.||5 andball ||6-and operates relative to depressions locating the` lever in position where the segment is clear of contact withthe stop dogs. AY pin ||8 fixed in the pivot plate traverses an arcuate slot ||9 located concentrically with relation to the pivot of ythe lever.. This slot provides a definite limit to swinging movement of the lever `inthe direction for clearing `the same from contact with the stops.`

Therefore, the contact lever, when regarded inits entirety or. as..a.unit,.includes the element incorporating the lever `and segment, and the pvot plate which is longitudinally adjustable for Varying the position ofv the segment relative to the carriage.. The voperator moves the-rotatable adjustment rod an amount suiiicient toset the contact segment a distance toward or from the carriage equal'to the variation in center hole depth or work length.

In practice, for example in turning shoulders in quantity production worknn shafts as illustrated in the present. drawings, the operatorsets the stop dogs from the tailstock endof a given piece of work.` First. of all he sets a stop dog against the contact element of the carriage with the tool against the end face of the work. He

then feeds the carriage longitudinally by hand an the tailstock end 'of the machine formoving thev stop screw 90 of the stop dog bar against the support block, lthus declutching the feed to the carriage. With'the stopdog bar in position, where the clutch shiftingrod has been moved to declutching position, the stop dogs are then set. In the instance where a measuring bar or scale is used and the carriage moved to the point of the shoulder by reading the distance on the scale, the stop dogs are moved in each'instance against the contact lever `of 'the carriage and are then rigidly clamped in positions. In other words, theV carriage is moved longitudinallya given distance until the tool is at the. desired point and the stop dog is then abutted against the segment of the contact lever, assuming that. the levernhas been-swung downwardly, to place the segment where its path of movement Willcause it toy contact the stop dogs. It will be. noted at thispointthat the longitudinalcontact.extensionsof the stop dogs are disposed-.atdifferent elevations so that they may overlap in cases where shoulders shorter than the actual length of the dogs are being turned.

With the stop dogs all in position, the operator then returns the crank handle to normal position, thus throwing the feed clutch into engagement. Through this means it is unnecessary to test the position of each stop dog to determine whether or not the throw out will occur at the proper time to locate the shoulder accurately. Once having set the stop dogs a run of shafts or any other work may be operated upon without varying the stop dog positions, even though the depth of the center hole at the tailstock end of the lathe or the length of the work may vary.

'Ihe rst stop dog is set with the bar in clutching position, eliminating the necessity for throwing the bar prior to testing the position of each piece of work. As the operator brings the carriage up to the first stop dog for each succeeding piece of work, he is able to note any variation in the depth of center hole or length of the particular piece of work as opposed to the piece just preceding. He is able to observe this variation by noting whether or not the tool is in direct alignment with the end face of the work. If there is disalignment he moves the tool carriage to bring the tool directly in line with the end. of the shaft. He then adjusts the contact lever moving it longitudinally o-r parallel with the carriage feed against the first stop where it is rigidly secured in position by means of the clamping bolt. In other words, the abutment or contact element of the carriage is adjusted a distance which is exactly equal to the difference or variation in center hole depth or length of work. Thereupon operation upon a particular piece may be performed without altering the respective positions of the stop dogs on the bar.

'I'he stop dogs, as stated, include contact arms projecting forwardly parallel with the bar, the arms of the respective stop dogs being disposed in different planes. The arm of the forward stop dog is in the highest plane and the remainder of the arms are stepped down in elevation toward the rear. Also, the forward longitudinal faces of these arms are in different planes. The planes of the arms recede from the rearmost stop dog, each arm being successively set back toward the forward one, Accordingly, if it should be desirable to turn shoulders which are close together, the arms of the adjacent stop dogs can be overlapped. The abutment lever on the carriage when swung clear of the lirst stop dog after contact therewith and then released will rest against the forward longitudinal edge of the rst stop dog and will ride along this edge until it comes in contact with the end of the second stop dog, although this latter end is within the extent of the first mentioned arm due to the previously described offsetting in vertical and horizontal planes.

Having described my invention, I claim:

l. In a lathe, a bed, spindle means for supporting work, a carriage incorporating a tool for forming the work, a feed rod for translating the carriage along the bed in relation to the work, a clutch controlled drive for said feed rod, a longitudinally shiftable bar adapted to shift the clutch for disengaging the same, stop dogs adjustably mounted along the bar, a lever, having a plate portion, pivotally mounted on the carriage, the plate portion adapted to be swung into position for contact with the stop dogs, as the carriage moves, and means for varying the longitudinal position of the plate portion on the carriage in relation to the carriage to compensate for variation in the depth of the center holes in the work or the length of the work without resetting the stop dogs.

2. In a lathe, a bed, means for supporting work, a carriage longitudinally movable on the bed including a tool for operating on the work, a feed rod for moving the carriage along the bed and the tool in relation to the work, a bar longitudinally adjustably mounted on the side of the bed, a clutch for controlling the drive to the feed rod, a connection between the bar and the clutch for disengagement of the clutch, stop elements adjustably mounted on the bar, a device for shifting the bar a predetermined amount for disconnecting the clutch, and means on the carriage successively engageable with the stop dogs for automatically declutching the feed to the carriage when given points are reached on the work.

3. A mechanism for controlling the feed of a tool carriage including the carriage, feed rod and driving mechanism for the feed rod; comprising, a bar slidably mounted along the path of movement of the carriage, a series of stop dogs adjustably mounted on the bar, a clutch for connecting the power to the feed rod, said feed rod constituting a shifting rod for the clutch, an arm extended from the bar for shifting the feed rod, said stop dogs adapted to be interposed in the path of movement of the carriage and effective for disconnecting the clutch when engaged Iby the carriage, and a device for moving the bar carrying the stop dogs a predetermined amount, sufficient for disconnecting the clutch independently of carriage actuation of the stop dogs.

4. A mechanism for controlling the feed movements of a tool carriage including the carriage and the feed rod therefor, comprising; a slidably mounted bar movable along the path of movement of the carriage, stop dogs longitudinally adjustably secured on said bar, clutch controlled power means for driving the feed rod, shifter means for operating the clutch, said bar including an extension adapted to engage the clutch, an adjustably mounted pivot bracket secured to the carriage and adapted to be adjusted parallel to the bar, a swinging lever pivotally mounted on the pivot bracket and including a plate portion adapted to be swung into position where it will contact any one of the stop dogs, rwhereby the lever may be spaced from the carriage as desired and will be effective for successively engaging the stop dogs and disconnecting the clutch.

5. A tool feeding mechanism comprising, a bed, a carriage translatably mounted on said bed and carrying a tool, a feed rod traversing the carriage and adapted to move the same along the bed,

means for driving the feed rod, a clutch for disengaging the power means, a shifter bar slidably mounted along the path of movement of the carriage, a handle connected to the bar for manually moving the same a predetermined amount sumcient for declutching, means in the connection of the handle to the bar for holding the bar in position when the handle is released, stop dogs mounted on the bar and adapted to be interposed in the path of movemen of the carriage whereby the clutch may be automatically disengaged at predetermined points in the movement of the carriage and the bar may be moved into and held in a normally declutched position for setting the stop dogs while in this position.

6. In a feeding mechanism for a machine tool of the class described, inclu-ding, a bed, a carriage adapted -to Ibe fmoved. along. thebed, a stop dog Lbar .vadjustably mounted along the side of the hed,.a drivingi mechanism for the .carriage :including a longitudinally shiftable feed rod and a drive meanstherefoL-a olutch'onvthe end of the feed -rodfor disengagingtheidrive means therefor, springvurged shifter meansnormally maintaining .theaclutchin engaged position, a stop dog bar .,having a portion in engagement with the feed rod loi forshiftingythe same, stop dogs mounted for-,adjustmentalong the .-bar, Aa screw-threaded rotat- .a able element engaging. the bar including a crank handlexand adaptedxto .translate thebar, component stopelements onthe bed vand bar respectively l5 for ;limiting movement .of the. bar in declutching `direction, and meansf ongtheicarriageengageable with theystop1dogsfor;,s1iding the bar andzfeed vrodandldeclutching.

7. In. a` carriage feeding amechanism for use on f a-machine tool including affeed rod; driving means ,anda clutch therefor ha shifter; means for oper- ,latingglthe clutchlzincluding. a'fbargslidably vsup- `,'.portedalong the pathxoffmovement .of the-car- Y riage;, azpivot bracketslidably adjustably mounted A onN the carriage, an. adjustment Y screw screwthreadedpthrouglra portion of. the carriage for setting thefpivot Abracket 1in anyidesiredy position, sstopndogs` adiustably mountedalong; the bar, a swinging.leverffpivotedzonthebracket and includfing` a'plateportionpladapted to be placed inA posi- `,tion for fengaging :the z stop:5,.dogs v.and declutching the clutch; for r stopping a the: movement of i the carriage,` said Alever :disposed in4 position at one 1endiofI thercarriage and-,projecting upwardly to a position adjacent thetop ofthe carriage.

.8.:Innia lathefincludinga bed,a headstock, a ,tailstock, a carriagerslidablymounted on thebed :between therheadstock and tailstock, `a feed rod for :translatinggthe carriageaand a` `transmission ,40. :forrotating thei feed` screw a clutchfor -discon- .neotingthe powerltosaid feed-screw, saidfeed rod mounted longitudinally `,ofi-the bedE parallel Vwith `,thefeediscrew for,adiseng aging the clutch,;said rodsupported in the feed boXawalLan-d. ina jour- `4;,nal bracket, said journal :bracket includinga `spring `under compression; engaging the feed rod `foixnormally.` urging theVV feedrod to declutched ,positionstops vforalimiting theL movement of the `Yfeed rod in eithendirectiom a stopfdog supporting y `50 bar.,adjustably,translatably mountedl ,onthe side of the bedformovement along the pathofmove- Ament ofthe carriage, stop dogs on said bar, means on the carriage adapted to engage saidstop dogs, a.,screwthreaded.4 through kthe journal bracket dadjacent' the .endtof Asaidrloar, endthrust bear- ,ingshetweennthebar and screw, a Acollar ;on the ,-.feed r-od,` a rigidsarm. extended from-.the-bar Vand .adapted.toengagethecollar,4 a-,spring for. normally maintaining the .bar in. declutching, posi- .p60 tion, a crank handle on .theend of the-screws for imparting a predetermined number ,of degrees -of movement' tof the rotary shaft sufficient 'for -declutching thereby venabling Vthe operator' .to set thestopfdogsfwith the'bar` in position where the `65 clutch is'disengaged.

9. carriage feeding-mechanism,comprising, a feed rod,-a ldriveitherefor,` a= clutch for :the drive `,'forncon-necting :the-:same .to .theifeed Arod, a bar movably mounted along the path of movement of 70 the carriage, stop :dogs.adjustablymounted onthe 1. bar;anabutment-elementpivotally-and longitudinally-V adjustablynmounted;v onfand in 'relation'` to the carriage, saidfelemenizincludingya:plate rportion/ and fa handlepportionwhereby ,itican be `75 swungA into position Where theiplate portion will engagethesstop5dogs,.said bar connected toisaid clutchfordisconnecting the same .when the ele- 1 mentengages and moves the stop dogs.

10. In a carriage feeding mechanism, including, the carriage,v the feed rod, drive therefor and i clutch, a barshiftably-mounted along the path of movement of the-carriage, stop dogs mounted on the bar, a connection between the barand the clutch whereby movement of the bar operates lthefc1utch,^an abutment element on the carriage for engaging the stop dogs, and a 'manually 0perated means-connected to the bar for translating the'bar-a predetermined amountsufficient for declutching the clutch.

i 1'l.'In' a tool feedingmechanisma bed, a tool carri-age, a feed rod for moving the carriage-along the bed, gearing for driving the feed rod, a clutch for connecting the gearing and feed rod, stops adjustably mountedalong the path of movement vofsthe carriage vand connected to the clutch fori:

actuating saidclutch, a contactelement pivotally .mounted on the tool carriage an-d adaptedr to be v.swung` into ,and out of, position for engagement fwith the, stops as thetool carriage is fed, and

4means -for moving the stops .and clutch'to disengage the-drive to. the feed rod independently of vactuation of the dogs through'the contact element of the-carriage.

l2. In a tool feeding mechanism, a bed,a tool carriage, a feed rod for moving the carriage-along '.thetbed, gearing'for driving the feed rod, a .clutch for connecting` the gearing andfeed rod, stops adjustablymounted'along the path of movementl of the carriageand connected to the clutchY for Aactuatingsaid clutch,:a contact element onr the carriage forsuccessively-engaging said stops and disengaging the clutch, said contact element adjustably mounted for resetting toward andv from v.the carriage,said dogsengage-able by said carriage as the carriage 4is fed for stopping carriage feed, and a clutchshifter for movingV the clutch tol disengaged position while the dogs are being set.

v13. In .-aflathe, a` bed, means for supporting work, a carriage incorporating a tool for operating on the work, a feed rod for translating the carriagealong the bed in relation tothe work, a clutch controlleddrive for said feed rod, a 1onvgitudinally shiftable bar connected to the clutch vfor disengagingthe same, stop dogs located on the bar, an element pivotally mounted on the carriagel adapted to be swung into position for .contactwith and actuation of the stop dogs, and adjustment means for varying the longitudinal position of the element on the carriage in relai"od, a'journalbracket for one end of the feed rod includingla spring under compression en- -5gaging-the feed rod for normally urging the feed rod to V,declutching position, a stop dog support- Aing bar '.adjustably translatably mounted on the side of the bed for movement along the path of movement of the carriage, stop dogs adjustably securedy along'said bar,'means on the car- Mriage adapted to engage said stop dogs, a rigid Varmlzextendedfrom the bar and adapted to engageand .translate the feed rod, a vspring for.,

normally maintaining the bar in declutching position, and a screw including a handle and adapted to shift the bar a predetermined amount sufcient for declutching.

i5. In a carriage feeding mechanism including the carriage, the carriage feed rod, the driving means for the feed rod, and a clutch for disconnecting the driving means from the feed rod; a shiftable bar supported along the path of movement of the carriage, stop dogs mounted on the bar, an abutment means on the carriage successively engageable with the stop dogs, said bar connected to said clutch whereby the aforesaid engagement causes declutching, and manual shifting means for moving and holding the bar in declutching position While the dogs are being set.

16. In a carriage feeding mechanism including the carriage, the carriage feeding means, the driving means for the carriage feeding means, and a clutch for disconnecting the driving means from the carriage feeding means, a shiftable bar supported along the path of movement of the carriage, stop dogs mounted on the bar, an abutment means on the carriage adapted to selectively engage said stop dogs, said bar connected to said clutch whereby the aforesaid engagement causes declutohing, and a shiftn ing device for moving the bar and operating the clutch for disconnecting the driving means from the carriage feeding means.

WILLIAM G. HOELSCHER. 

